Pulsameter.



H. E. HEATH.

PULSAMETER. APPLICATION FILED sPT.'24,1908.

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UNITED srnfrns VfrnrnNr orrion.

HARRY E. HEATH, 0F HARTFORD, CONNECTICUT.-

PULSAMETER.

To all whom. it may concern:

Be it known that I, HARRY E. I-IEATH, a

lcitizen of the United States, and a resident of Hartford, in the countyof Hartford and State of Connecticut, have invented certain new anduseful Improvements in Pulsameters, of which the following is aspecication.

rlhe object of the invention is to provide means for measuring the rateof pulsation of electric currents.

The apparatus is designed particularly to measure the rate of pulsationsin currents produced by static machines` when there is a proper balanceof capacity and inductance in other circuits.

Figure l of the drawings shows a plan view of one embodiment of myinvention. Fig. 2 shows an edge view thereof. Fig. 3 hows a detail ofone of the recording memers.

I will describe my invention as used in connection with a staticelectric machine equipped with condensers in the form of Leyden jarsconnected up in the proper manner. In such a machine the charge is builtup in the jaws until itis of sufficient strength to discharge acrossfrom one terminal to the other, a new charge immediately gathering againin the Leyden jar and being discharged in the same way. These dischargesor pulsations of the current are at regular fixed intervals'. It is ofconsiderable importance in certain branches of work for which theelectric currents, and particularly the currents generated in staticmachines, are used that the rate of pulsations of the current may beaccurately measured.

In carrying out my invention I provide a number of vibrating members, l,2, 3, 4, 5, 6, 7, 8, etc., each one of which has a natural rate ofvibration which can be readily deter-k mined, the rate of vibration ofeach of these members being different from that of the other members.

In the embodiment of the invention illus- ..-..tratedthe -vibratingmembers comprise bars c mounted rigidly on the end of flat springs Z2,the other end of these springs being secured to the projection o on thebase cl. These vibrating members vary in length as seen. The free endsof these arms stand a little away from the base, and thatv part of thebase immediately under these free ends Specification of Letters Patent.

Application led September 24, 1908.

Patented Dec. V5, 1911.

Serial No. 454,526. v

is preferably covered with a strip of metal e so as to localize thecharge. Provision is made for connectingthis device to the circuit andpreferably it is connected to one side of the circuit only and as thebase is made from a material vwhich is a fair conductor for the highpotentials such as are generated in static and like machines the wholedevice is charged with electricity of the same sign. At each charge ofthe device the arms and the localizing strip on the base repel oneanother. The charging and discharging of the base occurs in unison withthe pulsation of the current but for a certain rate of pulsation but oneof the spring arms will be effected and it will be that arm whosenatural rate of vibration coincides with the rate of pulsation; theparticular arm affected will vibrate continuously and evenly and canreadily be distinguished.

A scale s is arranged opposite the ends of the springarms and on thisscale the natural rate of vibration of yeach spring arm is noted. Vhenthe apparatus is connected up in the circuit the rate of pulsation ofthe current can be determined by noting the spring arm whose naturalrate of vibration coincides with the pulsations of the current andreading on the scale of its vibration, which will be the rate ofpulsation of the current.

I am aware that various changes in the structure and arrangement of theparts of this device can be made without departing from the spirit of myinvention.

I claim l. A device for measuring the rate of pulsation of an electriccurrent comprising, a series of vibrating members having differentnatural rates of vibration, a coperating member, and means forconnecting said. members to the pulsating circuit.

2. A device of measuring the rate of pulsation of an electric currentcomprising, a

series of spring arms having diiferent natural rates of vibration, acoperating member, and means for connecting said members to thepulsating circuit.

8. A device of measuring the rate of pulsation of anelectric currentcomprising, a base having a projection, a series of spring arms ofvarying lengths secured to said projection with their free ends inoperative relation to said base, and means for connecting said base andarms to the pulsating circuit.

4. A device for measuring the rate of pularnis, and means for connectingsaid base sation of an electric current comprising, a and arms to thepulsating circuit. base having a projection, a series of spring arms ofvarying lengths secured t0 said pro- HARRX E' HEATH' 5 jeetion withtheir free ends in operative re- Witnesses:

lation t0 said base, a localizing strip secured D. I. KREIMENDAHL,

to said base beneath the free ends of said Y H. E. HART.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

